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20 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP
Measure Pulse Width This means that the E1538 will measure the width of the logic 1 portion of
a pulse. The pulse width is sent to the algorithm in units of seconds. To
measure the high portion of a pulse (positive going edge to negative going
edge) set the channel input polarity to INP:POL NORM,(@<ch_list>). To
measure the low portion of the pulse (negative going edge to positive going
edge) set the channel input polarity to INP:POL INV,(@<ch_list>).
The value returned to an algorithm can be from 5µSec to 1 Second with
59.6nSec resolution.
To configure channels to measure pulse width use the command
[SENSe:]:FUNCtion:PWIDth <avg_count>,(@<ch_list>)
• <avg_count> sets the number of pulses to average when forming the
pulse duration value. More counts give more accurate readings, but
slower response to changing pulse widths.
• <ch_list> specifies the channels that will read pulse widths
To measure pulse width on channels 46&47
*RST
SENS:FUNC:PWID 4,(@146,147)
read puls width on chs 46&47
Algorithm reads the pulse widths on channels 146 and 147 and returns these
values in CVT elements 46 and 47
ALG:DEF ’ALG1’,’writecvt( I146, 46 ); writecvt( I147, 47 );’
INIT
start algorithm
. . .
SENS:DATA:CVT? (@46,47)
read pulse widths from CVT
Figure 12. Measure Pulse Width